Presentation

1. Acrylic Gearbox Creative
Journey
DAN GELLERT, JULIO MELO, RAYMOND BELL

2. Design Sketch

3. Different ideas of design
 Learning from other peoples mistakes.
 Making the design suitable for the job
 How will it perform ?

4. Safety Diagnosis
 Is it safe to use?
 How can we make it safe ?

5. Durability
 How much can it take ?
 Calculations needed.

6. Types of Gears

7. Performance formula
𝑝 =
𝑚2 𝑔2ℎ2
𝑡2 𝑉𝐼𝐷3
, where
 m = mass being lifted (min 8kg)
 g = acceleration due to gravity
 h = height the weight is lifted (min 0.5m, max 1m)
 t = time to lift weight a distance of h
 V = motor voltage
 I = motor current
 D = maximum axial length of gearbox
D
pulley
finish
start
mg
velocit
y
gearbo
x
Mass
being
lifted
h
motor

8. DC motor characteristics
Source:
https://www.google.com.au/search?q=dc+motor+efficiency+curve&rlz=1C1VFKB_enAU620AU620&espv=2&biw=1366&bih=667&sour
ce=lnms&tbm=isch&sa=X&ved=0ahUKEwiCyqjnyunLAhWEmpQKHZgTATwQ_AUIBigB#imgrc=i8qRUv34xsggqM%3A

9. Calculations
AT MAX EFFICIENCY
• Efficiency(%): 49.6
• Power (W): 5.96
• Speed (RPM): 9679
• Torque (G.CM):60
• Current (AMP): 2
AT MAX POWER
• Output (W): 6.44
• Speed (RPM): 7845
• Torque (G.CM): 80
• Current (AMP): 2.6
lifting mass (kg) g (m/s^2) force (N) velocity (m/s) velocity (cm/s) 6mm pulley ratio h (m) t (s) D (m) performance
8 9.81 78.48 0.075942915 7.594291539 40.03991042 1 13.16779 0.1 2960.133333
9 88.29 0.067504814 6.750481368 45.04489922 14.81376 2960.133333
10 98.1 0.060754332 6.075433231 50.04988803 16.45973 2960.133333
11 107.91 0.055231211 5.523121119 55.05487683 18.1057 2960.133333
12 117.72 0.05062861 5.062861026 60.05986563 19.75168 2960.133333
13 127.53 0.046734102 4.673410178 65.06485443 21.39765 2960.133333
14 137.34 0.043395952 4.339595165 70.06984324 23.04362 2960.133333
lifting mass (kg) g (m/s^2) force (N) velocity (m/s) velocity (cm/s) ratio for 6mm pulley h (m) t (s) D (m) performance
8 9.81 78.48 0.082059123 8.205912334 30.03419165 1 12.18634 0.1 2658.564103
9 88.29 0.072941443 7.294144297 33.7884656 13.70963 2658.564103
10 98.1 0.065647299 6.564729867 37.54273956 15.23292 2658.564103
11 107.91 0.059679362 5.967936243 41.29701351 16.75621 2658.564103
12 117.72 0.054706082 5.470608223 45.05128747 18.2795 2658.564103
13 127.53 0.050497922 5.049792206 48.80556142 19.8028 2658.564103
14 137.34 0.046890928 4.689092762 52.55983538 21.32609 2658.564103

13. Thank you for listening!